Hi,
 
   I'm looking for orchestral instruments plugins (VST) that I could use in Sonar (Artist). There is a very good strings package that comes with Sonar. But I'm looking for winds, brass and other types.
 
Maybe there are already good ones packaged with Sonar, but couldn't find much, at least real good ones.
I found one or two VST plugins on the net but they are either poor quality or synthesized.
 
May be one of you may guide me at some brand names?
 
Thanks.

Really depends on your budget. 

^That. There are all sorts of orchestra plugins out there but it depends how much you want to spend on them and also how educated you are on how to use them. I personally use East West Hollywood Orchestra but it's not a beginner friendly product.
 
Here's a starting point to get an idea: http://www.sweetwater.com..._Instruments_Orchestra

Thank you for proposing the products you have. The more products can look/try, the more I'll know which ones best fit my needs.
 
Btw, I have a strong background in 1) classical music and 2) computers (believe it or not!) but did not practiced real instruments since many years.
 
I'm no professional, my goal is to have fun at home creating or reproducing musical pieces.

Since "Cakewalk Sound Center" is included with Sonar Artist, it's possibly the simplest and cheapest to buy a couple of sound expansion sets, like these...
- Orchestral winds, brass & percussion:
https://www.digitalsoundfactory.com/products/orchestral-winds-brass
- Orchestral Strings:
https://www.digitalsoundfactory.com/products/orchestral-strings
- Modern Strings
https://www.digitalsoundfactory.com/products/modern-strings
- Seinway Grand Piano
https://www.digitalsoundfactory.com/products/steinway-grand
 
These sounds are of great quality, they are very cheap and cover everything you need to build entire orchestral performances.
 
Or, if you want even better sounds without paying too much, you could investigate the "Garritan Personal Orchestra" software, which works as a VSTi inside Sonar.
http://www.garritan.com/products/personal-orchestra-4/
  
 

If you are on a tight budget I always suggest Garritan Personal Orchestra 4. Good bang for the buck and extremely easy to use. It's weakest point is a lack of articulations but it is very good for meat and potatoes orchestrations.

last day of the sale, but ewql symphonic orchestra is 50% off right now.
http://www.soundsonline.com/Symphonic-Orchestra

If you buy Vienna Symphonic's Special Edition Collections, you will have a very high-quality orchestra without spending the amount required for the full Vienna or full East/West Hollywood collection.
 
This is not cheap, though.  It is in between cheap and top dollar, but is good enough for anything you would need to do.

Not sure if you can still get the Sample Tank 2 version of Miroslav cheap but its not bad if you can ST is 32 bit only though if that is an issue - you can probably get it as 64bit with ST3 but I assume it will be much more expensive but not sure.

If you want more prebaked sounds, the project SAM line is amazing. I have the entire albion range but love Orchestral essentials 1&2... here are a couple detailed vids by Guy Roland (really fun/super dude) that'll open your eyes: OE1: https://www.youtube.com/watch?v=Zl7d6jBTab8
multies:   https://www.youtube.com/watch?v=xFi1Y5QcUoo
OE2: https://www.youtube.com/watch?v=7J-04SM2-no
 
My next purchase is going to be Capriccio, from Sonnotek, which is an exquisite collection of riffs and lines, a fantastic gui, unbelievable control... lots of demos/vids and audio here:
https://soundcloud.com/sonokinetic/sets/capriccio